Furnace-boiler



3 SheetsSheet 1.

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E. B. PARKHURST.

FURNACE BOILER.

Patented Sept. 6, 1892.

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(No Model.) 7 3 Sheets-Sheet 2,

E. B. PARKHURST. FURNACE BOILER.

Patented Sept. 6, 1892.

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(No Model.)

3 Sheets-Sheet 3'. E. B. PARKHURST.

FURNACE BOILER.

Patented Sept. 6-, 1892.

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UNITED STATES PATENT OFFICE.

EDW'ARD B. PARKHURST, OF \VOBURN, ASSIGNOR TO THE COMPLETE COMBUSTION COMPANY, OF BOSTON, MASSACHUSETTS.

FURNACE-BOILER.

SPECIFICATION forming part of Letters Patent No. 482,188, dated September 6, 1892.

Application filed December 28, 1891. Serial No. 416,347. (No model.)

To aZZ whom it may concern.-

Beit known that I, EDWARD B.PARKHURST, a citizen of the United States, residing at Woburn, in the county of MiddleseX and State of Massachusetts, have invented certain new and useful Improvements in Furnace-Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

Downdraft upright f urnace-boilers of large size as at present constructed are inefficient, owing to the fact that no fiues are provided in the space over the crown-sheet, and consequently the mass of water which occupies said space is not heated rapidly. It has not hitherto been deemed expedient, so far as known to me, to construct downdraftupright boilers of large size because of this difiiculty.

My invention has for its object to produce a downdraft upright furnace-b0iler which may bebuilt in any size and which shall obviate this difficulty; and it consists, essentially, in providing what I have termed a center chamber above the crown-sheet and preferably separated therefrom by a water-space, the fines from the combustion-chamber being arranged to open into the center chamber while the space in the boiler above the said center chamber is filled with lines which connect said center chamber with the smokeohamber at the top of the boiler with which the uptake is connected, all as hereinafter more particularly set forth, and the novel features of which are pointed out in the claims which are appended hereto and made a part hereof.

I have shown myinvention in the best form now known to me in the accompanying drawings, to which reference will be made in the following description, and in which- Figure 1 is a central Vertical section of a furnace-boiler embodying my invention, said section being on a plane passing from front to rear of said furnace-boiler. Fig. 2 is a front elevation, one half in vertical section, said section being on line 2 2, Fig. 1. Fig. 3 is a sectional View of the rear half of the boiler on line 3 3, Fig. 2. Fig. at is a transverse section, the left half of the figure being on the line 4 at, Fig. 2, and the right half being on line 5 5, Fig. 2.

A represents the outer shell of the boiler; B, the furnace-shell, which is located in the lower part of the boiler and is of the shape shown in Figs. 1 and i. There is preferably a water-space between the furnace-shell and the boiler-shell, as shown. At the rear and sides of the furnace-shell the ash-pit and combustion-chamber II extend out toward the boilershellthat is. the combustion chamber is larger in transverse area than is the fire-chamber. Extending vertically from the combustion-chainberandoutside ofthefire-chamberis placed aseries of vertical fl ues (Z, through which the draft passes and which open into a center chamber E. This center chamber is located within the boiler-shell a short distance above the crown-sheet of the furnace, and it is preferably separated therefrom, as also from the boiler-shell, by a water-space large enough to permit of the free circulation of the Water. A vertical tube P, relatively of large size, is placed vertically, preferably centrally, of said chamber E, and serves to connect the waterspace between said chamber and the crownsheet with the water-space above the said chamber. The water-space above the chamber is traversed by a series of vertical fluesf, which connect the center chamber with the smoke-chamber and uptake at the top of the boiler. The lluesf are of such size that their combined area or capacity equals or substantially equals the combined area or capacity of the upright flues d which surround the fire-chamber and which connect the combustion-chamber with the center chamber. The grate-bars and arrangements for allowing circulation therethrough are substantially the same as are shown in Letters Patent of the United States, No. 394:,131, dated December 4, 1888. A water-box g, which is partially supported by pins it, extends across the front of the firechamber. This Water-box serves to connect all the hollow grate-pipes it which extend therefrom, preferably obliquely upward, and enter'the water-space at the rear of the fire-chamber. The supply-pipes mfor the Water-box are preferably larger in diameter and fewer in number than the gratepipes and extend obliquely downward from the water-box to the water-space at the rear of the fire-chamber. By this arrangement the cold water'at the bottom of the waterspace of the boiler is caused to circulate upwardly through the supply-pipes and WaterboX and out through the grate-pipes, discharging into the water-space at the rear of the fire-chamber at a higher point therein. The uptake D is connected in the usual manner with the smoke-chamber at the top of the boiler.

By the employment of a center chamber such as I have described the water-space above the fire-chamber may be fitted with fines and all the benefits obtained in the upright construction that are now obtained in downdraft boilers having horizontal fines. The heating-surface of the crown-sheet is fully utilized, since awater-space is provided between the crown-sheet and the bottom of said center chamber E. A manhole t is provided by which a workman may enter the center chamber when that is desired. The draft passes down through the fuel into the combustion-chamber, where an intense heat is produced, thence up through the flues cl, which heat the water in the space around the fire-chamber to the center chamber E. Here the hot current is diffused through the chamher, and thence passes up through the fines f to the smoke-cha1nber and uptake. By this arrangement it is not only possible to construct a downdraft upright boiler-furnace of the largest size, but the fiercest heat is applied where the Water is least hot and the entire body of water in the boiler is raised in temperature with great uniformity and rapidity.

What I claim is 1. An 11 pright furnace-boiler prov1ded with a center chamber located above the crownsheet and larger in transverse area than the 40 fire-chamber,a series of flue-pipes connecting the combustionchamber with said center chamber and traversing the water-space between the sides of the fire-chamber shell and the boiler-shell, and another series of fluepipes traversing the water-space above said center chamber and connecting said center chamber with the smoke-chamber and uptake, substantially as shown and described.

2. An upright downdraft furnace-boiler provided with a water-grate and having a center chamber located above the crown-sheet of larger transverse area than the fire-chamher, a series of flue-pipes traversing the we ter-space around the fire-chamber and conmeeting said center chamber with the combustion-chamber, and another series of finepipes traversing the water-space above the center chamber and connecting said chamber with the smoke-chamber and uptake, substantially as shown and described".

In testimony whereof I affix my signature in presence of two witnesses.

EDWARD B. PARKHURST.

Witnesses:

WM. A. MACLEOD, ROBERT WALLACE. 

